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The word act, as used in the term Act of Congress, is a common, not a proper noun. The capitalization of the word act is deprecated by some dictionaries and usage authorities. Some writers, in particular the U.S. Code, capitalize Act.
Capitalization rules: 1  The first letter of every sentence must be capitalized. 2  Proper names of persons, places, things, days, and months (such as September). 3  Titles of distinction (such as Admiral or Captain). 4  The letters âIâ and âOâ when used by themselves.  Words of nationality (such as German, Dutch, Australian).